Speed control system for winding machines



Aug. 2, 1960 c. J. GONSALVES 2,947,490

SPEED CONTROL SYSTEM FOR WINDING MACHINES Filed Nov. 23, 1954 6Sheets-Sheet 1 INVENTOR (mind/0597i io/m/res BY wazw ATTORNEY Aug. 2,1960 c. J. GONSALVES SPEED CONTROL SYSTEM FOR WINDING MACHINES FiledNov. 23, 1954 6 Sheets-Sheet 2 I N VEN TOR Conraofi/osqofi farm/res@ZRNEY Aug. 2, 1960 c. J. GONSALVES 2,947,490 SPEED CONTROL SYSTEM FORWINDING MACHINES Filed Nov. 25, 1954 6 Sheets-Sheet 3 7/ I N VE N TORCop/'00 Jargofi fiolm/res ATTORNEY Aug. 2, 1960 c. J. GONSALVES SPEEDCONTROL SYSTEM FOR WINDING MACHINES Filed Nov. 23. 1954' 6 Sheets-Sheet4 C'mraaJoseffi 6006??! BY MW )7 TTORNEY 2, 1950 c. J. GONSALVES2,947,490

SPEED CONTROL SYSTEM FOR WINDING MACHINES Filed Nov. 23, 1954 6Sheets-Sheet 5 INVENTOR ConmaJosga/z 60/76'0/56'8 BY 4% W4 4 ATTORNEYAug. 2, 1960 c. J. GoNsALvEs SPEED CONTROL SYSTEM FOR WINDING MACHINESFiled NOV. 25, 1954 llllll 6 Sheets-Sheet 6 INVENTOR r 2,947,490Patented Aug- 2, 9

SPEED CONTROL SYSTEM FOR WINDING MACHINES Conrad Joseph Gonsalves,Arnhem, Netherlands, assignor to American Enka Corporation, Enka, N.C.,a corporation of Delaware Filed Nov. 23, 1954, S61. No. 470,679 Claimspriority, application Netherlands Nov. 28, 1953 8 Claims. Cl. 242-45This invention relates to winding machines and more particularly to anautomatic speed control for a winding machine.

In winding machines it is customary to provide a rotating shaft on whicha package support is placed. The shaft is driven at a constant speed andas successive courses of thread are laid up the effective diameter ofthe take up package increases. This, of course, causes an increase inthe peripheral speed of the wound body.

In order to prevent progressively increasing thread speed in the casewhen the thread is supplied with constant speed, it is known to lead thethread being wound across a dancer roll and to use movements thereof tocontrol speed.

The known devices do, not make it possible to adapt the speed of thewinding accurately to the supply speed and at the same time to keep thethread under a substantially constant tension.

It is an object of this invention to accurately maintain a predeterminedwinding speed of a winding machine throughout the entire winding onperiod automatically compensating for any local speed varying factors.

Other objects and advantages of this invention will be apparent uponconsideration of the following detailed description of severalembodiments thereof in conjunction with the annexed drawings wherein:

Figure 1 is an end view in elevation of a winding machine according tothe present invention;

Figure 2 is a view in vertical section taken at the plane of the line2-2 of Figure 3 and showing the winding speed control mechanism of thepresent invention;

Figure 3 is a horizontal sectional view taken at the plane of the line33 of Figure 2;

Figure 4 is a fragmentary perspective view further illustrating theelectric switch mechanism shown in Figure 2;

Figure 5 is a view in section taken on the line 5-5 of Figure 2;

Figure 6 is a view in section taken on the line 6--6 of Figure 2;

Figure 7 is a View in section taken on the line 77 of Figure 3;

Figure 8 is a view in section taken on the line 8--8 of Figure 3;

Figure 9 is a fragmentary view partially in section and partially inelevation showing a releasable interlock between the traverse mechanismand the take up speed control mechanism;

Figure 10 is a view in end elevation of a modified switch mechanism toprevent hunting of the control mechanism;

Figure 11 is a view in side elevation of the mechanism of Figure 10;

Figure 12 is a fragmentary view showing one operating position of themechanism of Figure 10;

Figure 13 is a fragmentary view showing another operating position ofthe mechanism of Figure 10;

Figure 14 is a view in side elevation of a modified 2 mechanism forpreventing hunt in response to a demand for speed correction;

Figure 15 is a view similar to that of Figure 14 but showing theapparatus in a different position;

Figure 16 is .a view in section taken on the line 1616 of Figure 14; and

Figure 17 is a view in section taken on the line 17.-17 of Figure 14.

From a consideration of Figure 1 it can be seen that thread 10' to bewound into the form of a crosswound package is led from a source, notshown, through a supply roll or delivery system 11, with constant speedunder a dancer roll 12, through a traverse mechanism 13 and onto abobbin or spool 14 on a drive shaft or spindle 15.

The traverse mechanism is entirely conventional and hence is shown onlyschematically. It is of the type in which a traverse button actuallycontacts the package surface, being held thereagainst by a counterweight16 pivoting about a pivot 17. While the delivery system 11 is onlyschematically shown it will sufiice to say that, whatever type is used,the delivery of thread to the winding machine will be at a generallyconstant speed so that the winding speed will be controllable by theperiph eral or take up speed of the package 18 on the bobbin 14, this,in turn, being a function" of the speed of spindle 15 and the diameterof package 18.

According to this invention, the speed of the thread 10 is controlled bycontrolling the speed of the spindle 15. This spindle extends behind thepanel-19 shown in Figure 1 and terminates in a disc 20 which is keyedthereto, .see Figures 2 and 3. The disc 20 is driven by frictionalcontact with a driving wheel 21 which is keyed to but axially slidableon a shaft 22. Shaft 22 is provided with a sheave 23 which is driven bya belt 24 from a power source, not shown.

The driving wheel 21 is biased to the left of 'its' Figure 2 position bya coil spring 25 which coaxiall-y surrounds shaft 22. The spring 25extends in compression between a fixed bearing block 26 and a movablecollar 27 which is freely slidable axially of the shaft 22. Apositioning roller 28 limits the action or effect of the spring 25 onthe wheel 21. It can be seen that if roller 28 is moved to the right ofthe Figure 2 position wheel 21 will move to the right against the thrustof spring 25 and disc 20 and spindle 15 will be driven faster due to theincrease in ratio between the radius of driving wheel 21 and theeffective radius of driven disc 20. Conversely, if roller 28 is moved tothe left of its'Figure 2 position, spring 25 will act to displace wheel21 to the left and the speed of disc 20 and hence spindle 15 will bereduced. This reduction, of course, afiects take up speed. It can now beseen that the winding speed of the thread is controlled by the positionof the roller 28 which in turn controls the position of the drivingwheel 21 on the driven-disc 20, the wheel and disc constituting avariable speed transmission between the drive shaft 22 and the drivenspindle 15,

Actually there are two broad reasons for variation in speed. One-ofthese is the steady increase in winding on speed due to increase inpackage diameter and the other is an intermittent one due to minorfactors such as small variations in the speed of delivery of the yarntothe system. In either case the effect of an increase in winding speed isan upward or counterclockwise bias of the dancer roll 12 while theeffect of decrease in speed is a downward or clockwise bias thereof, seeFigure 4: The dancer roll 12 is therefore used to sense variation in thedelivery speed of yarn supplied by system 11 and to control themovements of the roller 28%. To this end the dancer roll 12 is mountedon a lever 29 which is, at its other end, rotatably mounted on a fixedshaft 30. A spring 31 is connected at one end to the lever 29 and itsother end is anchored insc'rew 32 by which the torque exerted on thelever 29 is made adjustable.

The shaft 30 is supported by a bracket 33 which in turn is supportedfromjhe' frame of the machine. A vertical slot 34 is cut in the housingwall 35 to accom modate the movements of the lever 29. a b

-The lever 29 is connected by a torque transmitting coil spring 36 to ahub 37 which carries thereon a T switch element 38. The cross bar of theT switch 38 coacts with poles 39 or 40 of a switch element 41 carried onone arm of a bell crank 42 which is pivoted to the shaft 30. The otherarm of the bell crank 42 is biased in one direction by counterweight 43and in the other direction by a flexible rod or cable 44 slidable in aspiral sheath 44a. The cable 44 is connected to a lever 45 It can now beseen that if winding speed increases lever 29 is moved counterclockwiseand, through spring 36, T switch 38 moves to circuit closing positionwith pole 39. On the other hand a decrease in winding speed causes lever29 to move clockwise from the Figure 4 position to cause T switch tomove to circuit closing position with pole 40.

The circuit that includes the pole 40 also includes solenoid 46, seeFigure 5, and the circuit that includes the pole 39 also includes thesolenoid 47. These solenoids-selectively act on a lever 48 which ispivoted on a shaft 49. Fixed on the end of the lever 48 there is locateda V supporting bracket 50. On one arm of the V bracket 50 there ispivotably mounted an assembly including a friction drive pickup wheel 51and a coaxial gear 52. On the other arm of the V bracket 50 there ispivotally mounted a second friction drive pick up wheel 53 and a coaxialgear 54. Also depending from the arm of the V bracket which has thewheel 53 thereon is a rigid arm 55 having an idler gear"56 thereon inmesh with the gear 54. Gears 52 and 56 both mesh with a gear 57 whichwith a gear 58 is mounted for free rotation on shaft 49. Gear 58 mesheswith a gear 59 which is mounted on a shaft 60. The shaft 60 is threadedat 61 (see Figures 2 and 3) and carries thereon an internally threadedblock 62 from which the roller 28 is supported by a stud or stub shaft63. It can now be seen that the position of the dancer roll 12 willcontrol the energization of the solenoids46 and 47 and that thesesolenoids control the rotation of shaft 60 which in turn positionsroller 28 and wheel 21.

- Control of the transmittal of driving torque to the shaft 60 iseffected by angular displacement of the lever 48 about the shaft '49. Ifthe winding speed is lower than the desired predetermined value, thenthe circuit including pole 40 and solenoid 46 is closed by the T element38. This causes lever 48 to move clockwise from the Figure position.This clockwise movement causes wheel 51 to bear frictionally againstshaft 22 to be rotated thereby. When wheel 51 rotates, gear 52 rotatesand drives gear 57 which through gears 58 and 59 drives shaft 60 in aclockwise direction, as viewed in Figure 5, to cause the block 62 tomove to the right as viewed in Figure 2 and thereby to increasethe speedof spindle 15.

If the winding speed of thread is too high the circuit including pole 39and solenoid 47 is closed causing pick up wheel 53 frictionally toengage and to be driven by shaft 22. Due to the idler gear 56, thismovement causes shaft 60 to turn in a counterclockwise direction, asviewed in Figure 5. The block 62 moves to the lefit of the Figure 2position to decrease the speed of spindle 15. i

If neither of the solenoids 46 or 47 is energized the lever 48 will beheld in the Figure 5 position by balancing springs 64 and 65. The end ofthe lever 48 remote from the point of pivot is connected to anoscillation damping dashpot 66 located outside the panel 19.

It is apparent that when the solenoid 47 is actuated and the block 62 ismoved to the left, as it is viewed in Figure 2, the resulting reductionin the speed of spind e f allowed to continue too long, will causeclosure of the circuit including the pole 40 and the solenoid 46. Whenthat happens, correction occurs in the opposite direction. To preventhunting, the lever 45 is pivoted at 67 to the thread block 62 whichcarries the positioning roller 28. Thus, when the block moves 'to theleft, as viewed in Figures 2 and 8, the cable 44 is paid out orslackened causing the weight 43 to pivot the bell crank 42 to hasten theopening of the circuit including the pole 39 whereby to bring to anearly conclusion a hunting tendency on the part of the sensingmechanism. a

The starting position of the lever 45 at any given stage of the windingperiod is controlled by a rack 68 which receives, in a socket 69, thefree end.70 of the lever 45. The rack 68 is driven by a pinion 71mountedon a shaft 72 which extendsthrough the front wall of the machineand has mounted thereon a pinion 73 which meshes with a rack 74 at thebottom end of the counterweight 16 (see Figure 1). As the package 18increases in diameter the counterweight 16 is rotated clockwise asviewed in Figure 1. This tends to move the rack 68 to the left, as it isviewed in Figure 8, to tighten the rod or cable 44, thereby to move thebell crank 42 in the direction to close the circuit including the pole39 and the solenoid 47 to reduce the speed of spindle 15. It can be seenthat the space between the switch element 38 and the poles 39 and 40controls the amount of lost motion before the circuit is closed andhence the amount of permissible variation from the predetermined windingspeed of the thread.

It will be appreciated that during the winding period the diameter ofthe package progressively increases. In order for the peripheral speedthereof always to remain the same, the control system described aboveprogressively decreases the rotational speed of spindle 15 by shiftingblock 62, roller 28 and driving wheel 21 progressively from right toleft, as viewed in Figure 2.

A bracket 62a, which is fixed to the block 62 (see Figures 3 and 7),acts to support the spiral sheath 44a of the flexible rod or cable 44.Thus, the movement of the block 62 bends the cable or flexible rod 44but does not change the eifective distance between its ends, i.e., itdoes not change the amount of the cable which is projecting from thesheath at any given time. It follows, therefore, that throughout thewinding period the speed of spindle 15, and hence the winding speed, isseparately controlled by both the dancer roll and the traversemechanism. In this way, the speed of spindle 15 is always responsive'not only to both local thread speed and the diameter of the wound bodybut also to the algebraic sum of the movements of switch element 41,caused by increase in package diameter, and T-switch element 38, causedby variations in thread speed. The sensitivity of the dancer roll,therefore, is exactly the same throughout the winding period so that thesame amount of displacement thereof will cause the circuit to closeirrespective of whether the winding is just beginning, is midwayfinished, 'or nearly finished.

Micro pressure switches 75 and 76 (see Figures 3 and 8) are located inthe path of the lever 45 and if the lever moves too far in eitherdirection one or the other of these switches is actuated. The'switch 75functions to open the circuit which includes the solenoid 46 and theswitch 76 functions when actuated to open the circuit of the solenoid47. When the lever 45 is moving counterclockwise firom the Figure 8position and is paying out the cable 44, the bell crank 42 is movingcounterclockwise (as viewed in Figure 4) in a direction to close the,circuit which includes. the pole 40. Closing of this circuit energizesthe solenoid 46 which functions to increase winding speed by causing thespindle 15 to be driven at an increasing speed. If this increase isexcessive, switch 75 opens the circuit and stops the corrective action.Switch 76 operates the same way in the other direction.

It will be realized that during the winding period the wheel 21gradually moves to the left, gradually to reduce the speed of spindle 15as the package 18 increasesin diameter. At the end of the winding on, itis necessary to restore the parts to a starting position. This. can bedone either before or after the package 18 is removed from the spindle15.

Therefore, it is necessary to release the counterweight 16 from the restof the traverse mechanism 13. This is done by moving bell crank 77counter-clockwise from the Figure 9 position so that spring 78 can movelatching pin 79 from the position shown to a retracted positiondisconnecting the counterweight from the traverse mechanism. When thisis done, the pinion 73 can be driven backwards restoring counterweight16 with its rack 74 to starting position. In Figure 1, counterweight 16is shown in just about the position it will occupy at the end of thewinding on period.

Once the shaft 72 is free to turn by release of the latching pin 79 allthat is necessary is to run the block 62 to the extreme right of thethreaded portion 61 of the shaft 60, as viewed in Figure 2. To see howthis operation is accomplished reference should be made to Figure 6. Itwill be seen that there is a driving wheel 80 which is mounted at theend of shaft 22 opposite from sheave 23. This wheel has a groovedperiphery and can be placed in driving engagement with a like wheel 81on shaft 60 by a coupling or transmission wheel 82 having a convexperiphery. Wheel 82 is brought into position selectively by a bell crank83 which is pivoted at 84 and which is provided with a weightedoperating handle 85. In the fullline position of Figure 6 wheel 82. isout of contact with wheel 80. Hence, although Wheel 80 is being drivenfrom sheave 23, wheels 81 and 82 are stationary. When it is desiredtorun block 62 back to starting position, lever 85 is raised to thebroken-line position of Figure 6 and engaged in a latch 86 having jawswhich can be retracted electrically, or mechanically. When the lever 85is raised the bell crank rotates counter-clockwise about the axis 84 andpushes coupling wheel '82 into peripheral frictional engagement withwheel 80. The rotation of wheel 80 is now imparted from wheel 82 towheel 81 and block 62 'moves to the right of the Figure 2 position untila pin 87 thereon strikes an electric switch or mechanical device 88which is connected through conduit 89 to the latch 86. When latch 86 isopened, the weight of lever 85 causes it to fall to the full lineposition of Figure 6, again disconnecting wheels 80 and 81. At thispoint, the package 18 is doifed and the latching pin 79 re-engaged.

A modification of the switch mechanism of Figures 4 and 8 is shown inFigures to 13 inclusive. In these figures the shaft 90 corresponds toshaft 30 and the dancer roll 91 is mounted on the end of a lever 92.Coil springs 93 and 94 surround shaft 90 and for flexible transmissionpurposes connect the lever 92 to levers 95 and 96, see Figure 11. To theleft of lever 95 there is located an arm 97 which can turn on shaft 90but with resistance. A similar arm 98 is paired with lever 96. Arms 97and 98 are each provided with a pivoted pawl, the pawl 99 on the arm 98being typical of both. A fixed pin such as the one shown at 100 normallyholds the pawl 99 in unlatched position with respect to the coactinglatch 101 on the lever 96.

In case the dancer roll moves up and lever 96 is moved counter-clockwiseto a position close to arm 98 (in the angular sense) the smallinterfering switch projections 102 and 103 on the lever 96 and arm 98,respectively, will ,engage and lever 96 will displace arm 98 enough sothat pawl 99 will fall from the normal or Figure 10 position to theFigure 12 position. The projections 102 and 103 In case the windingspeed decreases due to the regula tion by means of a servomotor andbecomes smaller than the supply speed the dancer roll descends and atthis 'moment (a very small overregulation is suflicient) the I are wiredand provided with contact faces so that they may function as an electricswitch corresponding to parts 38, 39 and 40 discussed hereinabove.

. 6 lever 96 moves away from arm .98, interrupts the contact and theregulation stops, see Figure 13.

The return movement causes the lever 96 to pull along the arm 93 bymeans of the pawl and latch until the pawl strikes the pin to release.the connection between the arm 98 and lever 96. While lever 96 ispulling arm .98 the switch is open but the switch elements are keptclose together.

It will be understood that the lever 96, arm 98 and their switchelements 102-103 correspond to the switch 3339 of Figure 4. The similarparts, not shown, on the lever 95 and arm 97 function in the same way toreplace the switches 38-40 of Figure 4. Hence, the leads 104 and 105 inFigure 10 are in circuit with the solenoid 47 when this modification isused.

It will be appreciated that the device of Figures 10 to 13, inclusive,controls winding speed only as a function of dancer roll position. Inthe form of the invention shown in these figures, there is no use ofboth the package diameter and the dancer roll position as speed controlfactors acting cumulatively. The arrangement of Figures 10 to 13,inclusive, is in effect a slow make quick break one in which the levers95 and 96 each move through a predetermined arc before closing a switchbut, after closure, a very small movement in the other direction opensthe switch. See in Figure 10 that the lever 96 moves counterclockwisethrough a considerable are before switches 102 and 103 close. On theother hand, these switches open immediately upon any clockwise movementof the lever 96 from the Figure 12 position.

In Figures 14 to 17, inclusive, another slow make quick breakarrangement is shown. In this case, a switch lever 106 is fixed onashaft 107 which carries at its opposite end the dancer roll lever 108.Also mounted on the shaft 107 but free to rotate thereon is, a block109. Between the block 109 and the switch lever 106 there is located aspacer or shim 1.10 which is fixed to the shaft 107. The block 109supports two dependent parallel switch arms 111 and 112 which lie oneither side of the switch lever 106. The arm 111 carries a switch point113 which faces a switch point 114 on the arm 112. The lever 106 carriesoppositely extending switch points 115 which are positioned to registerwith the points 113 or 114 depending upon the direction of movement ofthe lever 106. Mounted on the block 109, in electrical circuit with thearm 111 and extending at right angles thereto, is a wiper brush 116. Asimilar Wiper brush 117 extends from the opposite side of the block 109and is in electrical circuit with the arm 112. By any convenientarrangement, arms 111 and 112 and their respective brushes 116 and 117are insulated from one another. At the back of a housing 118 whichreceives the various parts heretofore discussed there are segments 119and 120 which are wiped respectively by brushes 116 and 117. The segment119 includes an, insulated sector portion 121 and a conductive sectorportion 122. Similarly, the segment 120 includes an insulated sectorportion 123 and a conductive sector portion 124. The circuits are soarranged that the current flows through the lever 106, through the arm112, through the brush 117 and through the sector 124 when the dancerroll moves sufiiciently upwardly to require that compensation be madefor the increasein speed. The circuit includes a solenoid such as thoseshown in Figure 5 and, in the case depicted in Figure 15, the circuit isconnected to solenoid 47 to make the take up occur somewhat more slowlyto compensate for the increase in speed. On the other hand, if the lever108 had moved clockwise from the Figure 14 position, the circuit wouldhave been established from lever 106 through arm 111, brush 116 andsector 122 to the solenoid 46 or its equivalent.

It is very important to note that when lever 106 first moves from theequilibrium position of Figure 14, it contacts one or the other of theswitch arms 111 and 112. This, however, does not close the circuitbecause "at this stage brushes 1 16 and 117 mean the insulated sectors121 and 123, respectively. If, however, the moveinent of the dancer rollpersists, the lever 106 acting through the particular switch arm 111 or112, which it is contacting, drives the block 109 and with it thebrushes until the appropriate one of them completes the circuit throughthe appropriate conductive sector. Once the correction begins, however,the circuit is instantly broken as lever 106 moves away from the switcharm which it had been driving.

If reference is made to Figure 15, it will be noted that the circuit wasclosed when brush 117 first contacted conductive sector 124. However, ifthe lever 108 begins to move clockwise from the Figure 15 position, thecircuit will be instantly broken between the lever 106 and switch arm112. In other words, 115 will move away from the point 114. If the lever106 swings over to contact with switch point 113 it will not oppositelyenergize the system unless enough movement should occur to cause thebrush 116 to register with the sector 122. The effect of thisconstruction is to make a slow make quick break system to which isrestored the equilibrium with a minimum of hunting. The switches to bothsolenoids are in series so that to close the circuit both must be closedbut to open the circuit either may be opened.

The device according to the invention is suitable for the winding of anykind of thread or yarn and is preferably used for winding threads of lowdenier.

The device is especially suitable for winding threads or yarns,especially artificial silk, with constant speed on cylindrical orconical spools and in which a continuous adaptation of the speed ofrotation of the winding device to the speed of the supplied thread musttake place.

The device may not only be used for winding a single supplied thread ona winding device such as a spool but may also be used for the separatewinding of the threads from a plurality of threads supplied in the formof a warp.

'In such a case the winding speed of each separate winding spool may beregulated by the thread to be wound the driving of the individualwinding spools being derived from a common head drive.

The device according to the invention has important advantages incomparison to the known devices for the same purpose and which areprovided with a separate electromotor for each thread. The deviceaccording to the invention works more accurately than the known devicesand acts on small deviations of the thread length of the loop and not onfluctuations in the tension of the thread. The tension may therefore bekept very accurately and extremely low which is of great importance inthe winding of very thin threads.

While Figures 10 to 17, inclusive, are concerned with switch mechanismsunder control of a dancer roll, it is possible to use these incombination with a control responsive to increase in package diameter.

What is claimed is:

1. An automatic speed control system for a yarn winding machinecomprising a package support for collecting into package form yarndelivered thereto at an approximately constant speed, a constant speeddrive source, a variablespeed transmission interconnecting said packagesupport and said drive source, first means operative in response tovariations in speed of yarn delivered to said package support forvarying the input-output speed ratio of said transmission, additionalmeans operative in response to increase in diameter of said package alsofor varying the input-output speed ratio of said transmission, and meansoperative in response to variations in the input-output speed ratio ofsaid transmission for maintaining the sensitivity of said first meansirrespective of the diameter of'the wound package.

'2: An automatic speed control system for a yarn winding machinecomprising a package support for collecting into package form yarndelivered thereto at an approximately constant speed, a spindle on whichsaid support is mounted, a constant speed drive source, a vari ablespeed transmission interconnecting said spindle and said drive source,first sensing means engaged by the yarn and movable in response tovariations in the speed of delivery for varying the input-output speedratio of said transmission, additional sensing means engaging the yarnpackage and movable in response to increase in the diameter thereof forvarying the input-output speed ratio of said transmission, and meansoperative in response to variation in the input-output speed ratio ofsaid transmission for maintaining the sensitivity of said first sensingmeans irrespective of the diameter of the wound package.

3. An automatic speed control system for a yarn winding machinecomprising a package support for collecting into package form yarndelivered thereto at an approximatcly constant speed, a spindle on whichsaid support is mounted, a constant speed drive source, a variable speedtransmission interconnecting said spindle and said drive source, a firstpivotally mounted switch element, a second pivotally mounted switchelement which cooperates with said first switch element for selectivelyvarying the inputoutput speed ratio of said transmission, meansoperative in response to variations in speed of yarn delivered to saidpackage support for shifting said first switch element into contact withsaid second switch element, and'means op erative in response to increasein diameter of said package for shifting said second switch element intocontact with said first switch element.

4. An automatic speed control system as set forth in claim 1 and furthercomprising manually selectable means deriving power from-said drivesource for restoring said variable speed transmission to startingposition at the completion of a Winding operation.

5. An automatic speed control system as set forth in claim 4 and furthercomprising means for automatically disengaging said manually selectablemeans upon complete restoration of said variable speed transmission tostarting position.

6. An automatic speed control system for a yarn winding machinecomprising a package support for collecting into package form yarndelivered thereto at an approximately constant speed, means to drivesaid package support, a first pair of normally open switches connectedin series, means operative in response to closure of said first pair ofswitches for increasing the speed of said drive means, a second pair ofnormally open switches connecteddrive means, means alternatelyresponsive to a decrease in the speed of yarn delivered to said packagesupport for moving one switch of said first pair to closed position andto an increase in the speed of yarn delivered to said package supportfor moving one switch of said second pair to closed position, and meansresponsive to additional movement of the one switch of each pair forclosing the other switch of that particular pair.

7. An automatic speed control system for a yarn winding machinecomprising a package support for collecting yarn delivered thereto at anapproximately constant speed, a constant speed drive source, a variablespeed transmission interconnecting said package support and said drivesource, said transmission including a rotatable shaft and a blockmovable to vary the input-output speed ratio thereof, two pairs ofnormally open switches, the switches of each pair being connected inseries, normally inactive, reversible means for establishing a drivingconnection between said rotatable shaft and said block, directionalactuating means in circuit with each pair of switches for operating saidreversible means in a direction dependent upon which pair of switches isclosed, and speed responsive means engaged by the yarn delivered to saidpackage support alternately movable from a neutral position to closefirst one and then the other switch of each pair dependent upon thedirection of speed variation from normal of the delivered yam.

8. In an automatic speed control system for a yar winding machine havinga package support for collecting into package form yarn deliveredthereto at an approximately constant speed and means to drive saidpackage support, an improved slow make, quick break speed controlcircuit comprising a rotatable shaft, a switch lever fixed to said shaftand depending therefrom, a block mounted for free rotation on saidshaft, first and second mutually insulated switch arms attached to anddepending from said block in generally parallel relationship withrespect to said switch lever, a wiper brush extending from each switcharm, mutually insulated conducting means, one in the path of movement ofeach wiper brush, means in circuit with said switch lever and one ofsaid conducting means for increasing the speed of said package supportdrive means, means in circuit with said switch lever and the other ofsaid conducting means for decreasing the speed of said package supportdrive means, sensing means engaged by the yarn delivered to said packagesupport and connected to said shaft for moving said switch lever intocontact with the first of said switch arms and thereafter to pivot saidblock, thereby causing the corresponding wiper brush to contact one ofsaid conducting means when the yarn delivery speed is below apredetermined normal, and for moving said switch lever in the oppositedirec ticn into contact with the second of said switch arms andthereafter to pivot said block, thereby causing the other correspondingwiper brush to contact the other of said conducting means when thedelivery speed is above a predetermined normal.

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